Need help figuring out why my rig is overweight

So, I guess Im wondering what you expect to accomplish calling the manufacturer. You have the weights, they are what they are, and your loaded weight is not going to change with anything the manufacturer tells you.

My Grand Design 367 BHS was about 350 lbs heavier than the listed dry weight.

I suspect it's a combination of not accurate dry weight from manufacturer, and your stuff weighing more than you think.

Just not sure what you will accomplish arguing with manufacturer about dry weight.

Mike